random UIView switcher - iphone

I have three different views in my iPhone app, and when the user presses a button, I need the view to change to either of the three views randomly. I've found this code, but i don't know how to load images..sorry but i'm newbie....!!
- (IBAction) yourBtnPressed : (id) sender
{
int i = arc4random() % 3;
if(i == 1)
{
//load first view
}
else if(i == 2)
{
//load second view
}
else
{
//load third view
}
}


if view are all in the same viewcontroller you can simply write
self.view = firstView;
or for more cool transition you can use these method
+ transitionWithView:duration:options:animations:completion:
+ transitionFromView:toView:duration:options:completion:
see apple documentation:
http://developer.apple.com/library/IOs/#documentation/UIKit/Reference/UIView_Class/UIView/UIView.html


If your views are in a .xib file you can use this code:
[self.view addSubview:aView];
If you think to create your views programmatically, then:
UIView *aView = [[UIView alloc] initWithFrame:aFrame];
// add contents to your aView here
[self.view addSubview:aView];
[aView release]; // if you don't need it anymore

Related

UIButton is resized without visible cause?

I have ViewController(1) which hierarchy is like this
ViewController
- UIView
-- UITableView (height 80% of it's superview)
-- UIButton ( height 20% of it's superview, 80% offset y)
After pressing the UIButton new ViewController is pushed. Till now everything is okay, but in the moment of the animation I see that UIButton is resized to fit in the entire view. After going back now i have my button on the entire view.
What can cause this problem to appear?
1.
UIPopOverController
- UINavigationController
-- UIViewController
EDIT 1:
- (void)viewDidAppear:(BOOL)animated
{
// ...
_storeButton = [[UIButton alloc] initWithFrame:frame];
_storeButton.adjustsImageWhenHighlighted = NO;
_storeButton.backgroundColor = [UIColor colorWithHexString:(_productData.count > 0) ? #"0x8BC53F" : #"0xA4A4A4" ];
[_storeButton addTarget:self action:#selector(storeButtonTouched:) forControlEvents:UIControlEventTouchUpInside];
// ...
}
#pragma mark - Store request.
- (void)storeButtonTouched:(id)sender
{
DLog(#"_storeButton: %#", _storeButton);
if ( _productData != nil && _productData.count > 0) {
_productData = [NSArray arrayWithArray:_iapManager.productData];
TTIAPTableViewController *iapVC = [[TTIAPTableViewController alloc] initWithStyle:UITableViewStylePlain];
iapVC.entries = _productData;
iapVC.contentSizeForViewInPopover = self.view.frame.size;
[self.navigationController pushViewController:iapVC animated:YES];
[iapVC release];
} else {
DLog(#"No products available.");
}
}

Solved through using Containing ViewControllers.

How to set a view to a tag set in code not in Interface Builder?

I have an app that uses 4 different xibs, lets call them 1-4
So you start on view 1, if you press the button it takes you to view 2, on view 2, you have a back button (which takes you to 1) and forward button that takes you to 3 etc
Anyway, I am removing the next page buttons, and have added a swipe control instead of pressing a button, you can swipe to the next page.
However, I need to know how I can call a tagged view, using the swipe.
At the moment, the UIButton for next page is set in IB as tag 1
This is my swipe code (this is page 1 so only has a swipe left)
- (IBAction)swipeLeftDetected:(UIGestureRecognizer *)sender {
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
Page2ViewController *UIViewController =
[[Page2ViewController alloc] initWithNibName:#"Page2ViewController~ipad" bundle:nil];
[self presentModalViewController:UIViewController animated:YES];
}else{
Page2ViewController *UIViewController =
[[Page2ViewController alloc] initWithNibName:#"Page2ViewController" bundle:nil];
[self presentModalViewController:UIViewController animated:YES];
Page2ViewController *VC = [[Page2ViewController alloc] initWithNibName:#"Page2ViewController" bundle:nil];
[self presentModalViewController:VC animated:YES];
[self.view removeGestureRecognizer:[self.view.gestureRecognizers lastObject]];
[VC release];
}
}
Whereabout in that code, can I tell it to swipe to tag 1?
Would appreciate any help :)
Thanks,
Chris
---- Updated FAO Rob;
In the appdelegate.m
- (void)swicthView:(int)viewControllerIndex :(CGRect)viewRect {
if (viewControllerIndex < 0 || viewControllerIndex > viewControllers.count) {
//invalid index passed to function - do nothing
}else{
if (subViewForceUseNibSize == NO) {
//pass the view frame size at runtime
if (CGRectIsEmpty(viewRect) || viewControllerIndex == 0) {
//no frame size so force full screen
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
viewRect =CGRectMake(0, 0, 320, 480);
}else{
viewRect = CGRectMake(0, 0, 768, 1024);
}
}
}else{
//force use the nib size, so reduce size of NIB to leave display of NIB main nib below
viewRect = ((UIViewController *)[viewControllers objectAtIndex:viewControllerIndex]).view.frame;
}
}
//swicth our view
if (viewControllerIndex == 0) {
/*
for (UIView *subview in window.rootViewController.view.subviews) {
[window.rootViewController.view sendSubviewToBack:subview];
}
*/
for (int x = 1; x<[viewControllers count]; x++) {
if (((UIViewController *)[viewControllers objectAtIndex:x]).view.superview != nil) {
[window.rootViewController.view sendSubviewToBack:((UIViewController *)[viewControllers objectAtIndex:x]).view];
}
}
[window bringSubviewToFront:((UIViewController *)[viewControllers objectAtIndex:0]).view];
return;
}
if (((UIViewController *)[viewControllers objectAtIndex:viewControllerIndex]).view.superview != nil) {
((UIViewController *)[viewControllers objectAtIndex:viewControllerIndex]).view.frame = viewRect;
[window.rootViewController.view bringSubviewToFront:((UIViewController *)[viewControllers objectAtIndex:0]).view];
[window.rootViewController.view bringSubviewToFront:((UIViewController *)[viewControllers objectAtIndex:viewControllerIndex]).view];
}else{
((UIViewController *)[viewControllers objectAtIndex:viewControllerIndex]).view.frame = viewRect;
[window.rootViewController.view bringSubviewToFront:((UIViewController *)[viewControllers objectAtIndex:0]).view];
[window.rootViewController.view addSubview:((UIViewController *)[viewControllers objectAtIndex:viewControllerIndex]).view];
}
}

Looking at the revised code sample, it is clear that there is a UIAppDelegate method called swicthView [sic] that is used for transitioning between five different view controllers, all of which are loaded simultaneously. Given this structure, it is advised that you have a property to keep track of which of the five pages is loaded, and based on the left or right swipe, invoke swicthView to transition to that controller. Thus:
#interface ViewController ()
#property (nonatomic) NSInteger currentPage;
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.currentPage = 0;
UISwipeGestureRecognizer *gesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleLeftSwipe:)];
gesture.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:gesture];
[gesture release];
gesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleRightSwipe:)];
gesture.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:gesture];
[gesture release];
// the rest of the viewDidLoad
}
- (void)handleLeftSwipe:(UISwipeGestureRecognizer *)gesture {
if (self.currentPage < 4)
{
++self.currentPage;
[UIAppDelegate swicthView:self.currentPage :CGRectZero];
}
}
- (void)handleRightSwipe:(UISwipeGestureRecognizer *)gesture {
if (self.currentPage > 0)
{
--self.currentPage;
[UIAppDelegate swicthView:self.currentPage :CGRectZero];
}
}
Frankly, I'd strong advise retiring the swicthView design and rather employing a custom container view controller. If you watch WWDC 2011 - Implementing a UIViewController containment, you'll see a good introduction about the importance of keeping a view controller hierarchy synchronized with a view hierarchy, and see some practical demonstrations of custom containers.
The original answer, provided below, was based upon the original snippet of code that was performing presentViewController. It turns out that a very different solution was called for, outlined above, but I retain the original answer for historical purposes:
Original answer:
I assume you have the following sort of code in viewDidLoad:
UISwipeGestureRecognizer *gesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleLeftSwipe:)];
gesture.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:gesture];
And then you gesture handler could be:
- (void)handleLeftSwipe:(UISwipeGestureRecognizer *)gesture
{
NSString *nibName;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
nibName = #"Page2ViewController~ipad";
else
nibName = #"Page2ViewController";
Page2ViewController *controller = [[Page2ViewController alloc] initWithNibName:nibName bundle:nil];
// if supporting iOS versions earlier than 5.0, then you should use:
//
// [self presentModalViewController:controller animated:YES];
//
// otherwise you should use presentViewController as done below.
[self presentViewController:controller animated:YES completion:nil];
[controller release];
}
Note, I'm don't remove the gesture (unless you really don't want the gesture there when you return back to this view, which is unlikely). Also note, I'm creating controller, presenting, and releasing.
I'm not understanding your repeated reference to tag properties in this context, as numeric tag values are used for identifying subviews of a view, not for identifying view controller or anything like that. So you say "UIButton for next page is set in IB as tag 1" and later you ask "Whereabout ... can I tell it to swipe to tag 1?" It doesn't make sense to "swipe to a button". You could, though, have the two handlers, the button's IBAction (which I'll call onPressNextButton ... I don't know what you called it) and the handleLeftSwipe call the same method, e.g.:
- (void)handleLeftSwipe:(UISwipeGestureRecognizer *)gesture
{
[self goToNextViewController];
}
- (IBAction)onPressNextButton:(id)sender
{
[self goToNextViewController];
}
- (void)goToNextViewController
{
NSString *nibName;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
nibName = #"Page2ViewController~ipad";
else
nibName = #"Page2ViewController";
Page2ViewController *controller = [[Page2ViewController alloc] initWithNibName:nibName bundle:nil];
[self presentViewController:controller animated:YES completion:nil];
[controller release];
}
References:
presentViewController, the preferred method for modal transitions.
presentModalViewController, the now deprecated method that you use if you need backward compatibility for iOS versions prior to 5.0.
Naming basics in the Coding Guidelines for Cocoa, for advice in naming variables and methods. Note variables generally start with lowercase letters and classes generally start with uppercase letters.

Objective-C how to disable user interaction selectively

I have a Main View Controller that has many subviews. What I want is to disable all other views except one subview and its subviews programmatically from the subview file. But all I get is all frozen views. What did I do wrong?
I tried this code:
#define kDontDisableUserInteraction 321
- (id)initWithFrame:(CGRect)frame
{
NSLog(#"initWithFrame");
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.tag = kDontDisableUserInteraction;
}
return self;
}
-(void)something{
MVC *myController = [self getMVC];
for (UIView* subview in myController.view.subviews) {
NSLog(#"subview.tag %i", subview.tag);
if (subview.tag != kDontDisableUserInteraction){
subview.userInteractionEnabled = NO;
}
}
for (UIView *view in self.subviews){
NSLog(#"enabled!");
view.userInteractionEnabled = YES;
}
}
- (MVC *)getMVC {
Class vcc = [MVC class]; // Called here to avoid calling it iteratively unnecessarily.
UIResponder *responder = self;
while ((responder = [responder nextResponder])) if ([responder isKindOfClass: vcc]) return (MVC *)responder;
return nil;
}

Following links may be helpful:
How to disable touch input to all views except the top-most view?
UIView -- "user interaction enabled" false on parent but true on child?

I solved it by applying a full screen of a button on all other views and get the one view that I want to have user interaction upon the button. This way I disallow the user to click on any function except the one view I want the user to click on certain functions.

My Custom UIView Show but nothing inside it when using iCarousel?

I'm Using iCarousel to show my Custom UIView in CoverFlow Mode but when i run my app it is show up but nothing inside it , it is like not the view i add ???
so can u help me ???
- (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view
{
CustomView *temp;
if (view == nil)
{
//don't do anything specific to the index within
//this `if (view == nil) {...}` statement because the view will be
//recycled and used with other index values later
view = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 315.0f, 350.0f)] autorelease];
temp=[[CustomView alloc] initWithFrame:view.bounds];
temp.backgroundColor=[UIColor redColor];
view.contentMode = UIViewContentModeCenter;
temp.tag=1;
[view addSubview:temp];
}
else
{
//get a reference to the label in the recycled view
temp = (CustomView *)[view viewWithTag:1];
}
//set item label
//remember to always set any properties of your carousel item
//views outside of the `if (view == nil) {...}` check otherwise
//you'll get weird issues with carousel item content appearing
//in the wrong place in the carousel
//label.text = [[items objectAtIndex:index] stringValue];
return view;
}

Some thinks you could check :
Did you implement iCarouselDelegate and iCarouselDataSource ?
Did you set the carousel's delegates
ex. myCarousel.delegate = self; myCarousel.dataSource = self;
Did you add the carousel's view to the view stack
ex. [myView.view addSubview:myCarousel];
You should also implement the following delegate method
(NSUInteger)numberOfItemsInCarousel:(iCarousel *)carousel

How to load multiple views on each button tap when using a UISegmentedVIew

I have a UISegmentedControl with a 3 button layout that I use to control a 3 Views layout that I have
I am able to detect the taps on each button but how to I load and show the views that I want for each view
They have to be loaded 1 time and shown upon the tap of the ID of the UISegmentedView
It's a edit-save situation with multiple pages..

Use the selectedSegmentIndex property of the UISegmentedControl object.
if (segmentedControl.selectedSegmentIndex == 0) {
NSLog(#"segment 1");
if (view1 == NULL) {
view1 = [[UIViewController alloc] init];
[self.view addSubview:view1.view];
}
else {
[self.view bringSubviewToFront:view1.view];
}
}
else {
NSLog(#"segment 2");
if (view2 == NULL) {
view2 = [[UIViewController alloc] init];
[self.view addSubview:view2.view];
}
else {
[self.view bringSubviewToFront:view2.view];
}
}